There are several ways to differentiate between interrogative and relative pronouns. The most recommended one is the inclusion of the mark “do” behind the interrogative pronoun. As we have mentioned before, another possible way is to use the stressing and differentiating feature of the capital letters in multilinguale. Thus, it is possible to write the last letter of the interrogative pronouns in a capital letter. It is also accepted (though not recommended) to write the interrogative pronoun in the same way as the relative pronoun, without marks of any kind, and let the context itself to distinguish them.